[Perl/perl5] 0cf254: utf8.h: Fix syntax error only found on EBCDIC builds

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 0cf25474a4e6fde7b750472677d559b7e27f3360
      
https://github.com/Perl/perl5/commit/0cf25474a4e6fde7b750472677d559b7e27f3360
  Author: Karl Williamson <k...@cpan.org>
  Date:   2020-12-04 (Fri, 04 Dec 2020)

  Changed paths:
    M utf8.h

  Log Message:
  -----------
  utf8.h: Fix syntax error only found on EBCDIC builds